Nearly all the streets are in straight lines, _____ from east to west. Those _____ run from north to south are

called avenues. [ ]

A. running; that

B. run; who

C. running; who

D. run; that

患者，男，45岁。有动脉粥样硬化病史。突然感到剧烈刀割样胸痛2小时，向背部放射。查体发现主动脉瓣区可闻及舒张期杂音。考虑为主动脉夹层可能。下列是其常见的胸片表现的是（）

A.主动脉弓部和降主动脉上部影增宽

B.主动脉影狭小

C.主动脉搏动增强

D.主动脉影位置改变

E.主动脉影外形改变